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| 1 // Copyright 2014 The Go Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style |
| 3 // license that can be found in the LICENSE file. |
| 4 |
| 5 // +build darwin dragonfly netbsd openbsd windows |
| 6 |
| 7 package ipv4 |
| 8 |
| 9 import ( |
| 10 "net" |
| 11 "syscall" |
| 12 ) |
| 13 |
| 14 func setSysIPMreqInterface(mreq *syscall.IPMreq, ifi *net.Interface) error { |
| 15 if ifi == nil { |
| 16 return nil |
| 17 } |
| 18 ifat, err := ifi.Addrs() |
| 19 if err != nil { |
| 20 return err |
| 21 } |
| 22 for _, ifa := range ifat { |
| 23 switch v := ifa.(type) { |
| 24 case *net.IPAddr: |
| 25 if ip := v.IP.To4(); ip != nil { |
| 26 copy(mreq.Interface[:], ip) |
| 27 return nil |
| 28 } |
| 29 case *net.IPNet: |
| 30 if ip := v.IP.To4(); ip != nil { |
| 31 copy(mreq.Interface[:], ip) |
| 32 return nil |
| 33 } |
| 34 } |
| 35 } |
| 36 return errNoSuchInterface |
| 37 } |
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